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ddb634fe JL |
1 | /* |
2 | * Copyright 2006-2018 The OpenSSL Project Authors. All Rights Reserved. | |
3 | * | |
4 | * Licensed under the OpenSSL license (the "License"). You may not use | |
5 | * this file except in compliance with the License. You can obtain a copy | |
6 | * in the file LICENSE in the source distribution or at | |
7 | * https://www.openssl.org/source/license.html | |
8 | */ | |
9 | ||
10 | #include "internal/cryptlib.h" | |
11 | #include <openssl/asn1t.h> | |
12 | #include <openssl/ec.h> | |
13 | #include <openssl/evp.h> | |
14 | #include "internal/evp_int.h" | |
15 | #include "internal/sm2.h" | |
16 | #include "internal/sm2err.h" | |
17 | ||
18 | /* EC pkey context structure */ | |
19 | ||
20 | typedef struct { | |
21 | /* Key and paramgen group */ | |
22 | EC_GROUP *gen_group; | |
23 | /* message digest */ | |
24 | const EVP_MD *md; | |
25 | } SM2_PKEY_CTX; | |
26 | ||
27 | static int pkey_sm2_init(EVP_PKEY_CTX *ctx) | |
28 | { | |
29 | SM2_PKEY_CTX *dctx; | |
30 | ||
31 | if ((dctx = OPENSSL_zalloc(sizeof(*dctx))) == NULL) { | |
32 | SM2err(SM2_F_PKEY_SM2_INIT, ERR_R_MALLOC_FAILURE); | |
33 | return 0; | |
34 | } | |
35 | ||
36 | ctx->data = dctx; | |
37 | return 1; | |
38 | } | |
39 | ||
40 | static void pkey_sm2_cleanup(EVP_PKEY_CTX *ctx) | |
41 | { | |
42 | SM2_PKEY_CTX *dctx = ctx->data; | |
43 | ||
44 | if (dctx != NULL) { | |
45 | EC_GROUP_free(dctx->gen_group); | |
46 | OPENSSL_free(dctx); | |
47 | ctx->data = NULL; | |
48 | } | |
49 | } | |
50 | ||
51 | static int pkey_sm2_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src) | |
52 | { | |
53 | SM2_PKEY_CTX *dctx, *sctx; | |
54 | ||
55 | if (!pkey_sm2_init(dst)) | |
56 | return 0; | |
57 | sctx = src->data; | |
58 | dctx = dst->data; | |
59 | if (sctx->gen_group != NULL) { | |
60 | dctx->gen_group = EC_GROUP_dup(sctx->gen_group); | |
61 | if (dctx->gen_group == NULL) { | |
62 | pkey_sm2_cleanup(dst); | |
63 | return 0; | |
64 | } | |
65 | } | |
66 | dctx->md = sctx->md; | |
67 | ||
68 | return 1; | |
69 | } | |
70 | ||
71 | static int pkey_sm2_sign(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen, | |
72 | const unsigned char *tbs, size_t tbslen) | |
73 | { | |
74 | int ret; | |
75 | unsigned int sltmp; | |
76 | EC_KEY *ec = ctx->pkey->pkey.ec; | |
77 | const int sig_sz = ECDSA_size(ctx->pkey->pkey.ec); | |
78 | ||
79 | if (sig_sz <= 0) { | |
80 | return 0; | |
81 | } | |
82 | ||
83 | if (sig == NULL) { | |
84 | *siglen = (size_t)sig_sz; | |
85 | return 1; | |
86 | } | |
87 | ||
88 | if (*siglen < (size_t)sig_sz) { | |
89 | SM2err(SM2_F_PKEY_SM2_SIGN, SM2_R_BUFFER_TOO_SMALL); | |
90 | return 0; | |
91 | } | |
92 | ||
93 | ret = sm2_sign(tbs, tbslen, sig, &sltmp, ec); | |
94 | ||
95 | if (ret <= 0) | |
96 | return ret; | |
97 | *siglen = (size_t)sltmp; | |
98 | return 1; | |
99 | } | |
100 | ||
101 | static int pkey_sm2_verify(EVP_PKEY_CTX *ctx, | |
102 | const unsigned char *sig, size_t siglen, | |
103 | const unsigned char *tbs, size_t tbslen) | |
104 | { | |
105 | EC_KEY *ec = ctx->pkey->pkey.ec; | |
106 | ||
107 | return sm2_verify(tbs, tbslen, sig, siglen, ec); | |
108 | } | |
109 | ||
110 | static int pkey_sm2_encrypt(EVP_PKEY_CTX *ctx, | |
111 | unsigned char *out, size_t *outlen, | |
112 | const unsigned char *in, size_t inlen) | |
113 | { | |
114 | EC_KEY *ec = ctx->pkey->pkey.ec; | |
115 | SM2_PKEY_CTX *dctx = ctx->data; | |
116 | const EVP_MD *md = (dctx->md == NULL) ? EVP_sm3() : dctx->md; | |
117 | ||
118 | if (out == NULL) { | |
119 | if (!sm2_ciphertext_size(ec, md, inlen, outlen)) | |
120 | return -1; | |
121 | else | |
122 | return 1; | |
123 | } | |
124 | ||
125 | return sm2_encrypt(ec, md, in, inlen, out, outlen); | |
126 | } | |
127 | ||
128 | static int pkey_sm2_decrypt(EVP_PKEY_CTX *ctx, | |
129 | unsigned char *out, size_t *outlen, | |
130 | const unsigned char *in, size_t inlen) | |
131 | { | |
132 | EC_KEY *ec = ctx->pkey->pkey.ec; | |
133 | SM2_PKEY_CTX *dctx = ctx->data; | |
134 | const EVP_MD *md = (dctx->md == NULL) ? EVP_sm3() : dctx->md; | |
135 | ||
136 | if (out == NULL) { | |
137 | if (!sm2_plaintext_size(ec, md, inlen, outlen)) | |
138 | return -1; | |
139 | else | |
140 | return 1; | |
141 | } | |
142 | ||
143 | return sm2_decrypt(ec, md, in, inlen, out, outlen); | |
144 | } | |
145 | ||
146 | static int pkey_sm2_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2) | |
147 | { | |
148 | SM2_PKEY_CTX *dctx = ctx->data; | |
149 | EC_GROUP *group; | |
150 | ||
151 | switch (type) { | |
152 | case EVP_PKEY_CTRL_EC_PARAMGEN_CURVE_NID: | |
153 | group = EC_GROUP_new_by_curve_name(p1); | |
154 | if (group == NULL) { | |
155 | SM2err(SM2_F_PKEY_SM2_CTRL, SM2_R_INVALID_CURVE); | |
156 | return 0; | |
157 | } | |
158 | EC_GROUP_free(dctx->gen_group); | |
159 | dctx->gen_group = group; | |
160 | return 1; | |
161 | ||
162 | case EVP_PKEY_CTRL_EC_PARAM_ENC: | |
163 | if (dctx->gen_group == NULL) { | |
164 | SM2err(SM2_F_PKEY_SM2_CTRL, SM2_R_NO_PARAMETERS_SET); | |
165 | return 0; | |
166 | } | |
167 | EC_GROUP_set_asn1_flag(dctx->gen_group, p1); | |
168 | return 1; | |
169 | ||
170 | case EVP_PKEY_CTRL_MD: | |
171 | dctx->md = p2; | |
172 | return 1; | |
173 | ||
174 | case EVP_PKEY_CTRL_GET_MD: | |
175 | *(const EVP_MD **)p2 = dctx->md; | |
176 | return 1; | |
177 | ||
178 | default: | |
179 | return -2; | |
180 | ||
181 | } | |
182 | } | |
183 | ||
184 | static int pkey_sm2_ctrl_str(EVP_PKEY_CTX *ctx, | |
185 | const char *type, const char *value) | |
186 | { | |
187 | if (strcmp(type, "ec_paramgen_curve") == 0) { | |
188 | int nid = NID_undef; | |
189 | ||
190 | if (((nid = EC_curve_nist2nid(value)) == NID_undef) | |
191 | && ((nid = OBJ_sn2nid(value)) == NID_undef) | |
192 | && ((nid = OBJ_ln2nid(value)) == NID_undef)) { | |
193 | SM2err(SM2_F_PKEY_SM2_CTRL_STR, SM2_R_INVALID_CURVE); | |
194 | return 0; | |
195 | } | |
196 | return EVP_PKEY_CTX_set_ec_paramgen_curve_nid(ctx, nid); | |
197 | } else if (strcmp(type, "ec_param_enc") == 0) { | |
198 | int param_enc; | |
199 | ||
200 | if (strcmp(value, "explicit") == 0) | |
201 | param_enc = 0; | |
202 | else if (strcmp(value, "named_curve") == 0) | |
203 | param_enc = OPENSSL_EC_NAMED_CURVE; | |
204 | else | |
205 | return -2; | |
206 | return EVP_PKEY_CTX_set_ec_param_enc(ctx, param_enc); | |
207 | } | |
208 | ||
209 | return -2; | |
210 | } | |
211 | ||
212 | const EVP_PKEY_METHOD sm2_pkey_meth = { | |
213 | EVP_PKEY_SM2, | |
214 | 0, | |
215 | pkey_sm2_init, | |
216 | pkey_sm2_copy, | |
217 | pkey_sm2_cleanup, | |
218 | ||
219 | 0, | |
220 | 0, | |
221 | ||
222 | 0, | |
223 | 0, | |
224 | ||
225 | 0, | |
226 | pkey_sm2_sign, | |
227 | ||
228 | 0, | |
229 | pkey_sm2_verify, | |
230 | ||
231 | 0, 0, | |
232 | ||
233 | 0, 0, 0, 0, | |
234 | ||
235 | 0, | |
236 | pkey_sm2_encrypt, | |
237 | ||
238 | 0, | |
239 | pkey_sm2_decrypt, | |
240 | ||
241 | 0, | |
242 | 0, | |
243 | pkey_sm2_ctrl, | |
244 | pkey_sm2_ctrl_str | |
245 | }; |